Bailey, L. H. The Standard Cyclopedia of Horticulture. The Macmillan Co. New York, 1935.

Blakeslee, A. F. and C.D. Jarvis. New England trees in winter. Bull. No. 69, Storrs Agri. Exp. Sta. pp. 307-576. 1911.

Bode, I. T. and G. B. MacDonald. A Handbook of the Native Trees of Iowa. Iowa State College, Ames. 1914.

Brooks, A. B. West Virginia Trees. W. Va. Agri. Exp. Sta. Bull. 175. 1920.

Core, Earl L. Plant Taxonomy. Prentice-Hall. Englewood Cliffs, N.J. 1955.

Core, Earl L. and Nelle Ammons. Woody Plants of West Virginia in Winter Condition. Edwards Bros., Ann Arbor, Mich. 1946.

Fernald, M. L. Gray's Manual of Botany, 8th ed. American Book Co. New York. 1950.

Gleason, Henry A. The new Britton and Brown illustrated flora of the northeastern United States and adjacent Canada. 3 vols. The New York Botanical Garden. New York. 1952.

Harlow, William M. Twig Key to the Deciduous Woody Plants of Eastern North America. Published by the author. Syracuse, N.Y. 4th ed. 1941.

Harlow, William M. and Ellwood S. Harrar. Textbook of Dendrology. McGraw-Hill. 4th ed. 1958.

Hough, R. B. Handbook of the Trees of the Northern States and Canada. The Macmillan Co., 1955.

Illick, Joseph S. Pennsylvania Trees. Penna. Dept. For. Waters, Bull. 11. Harrisburg. 1928.

Muenscher, W. C. Keys to Woody Plants. 6th ed. Ithaca. 1950.

Otis, Charles Herbert. Michigan Trees. Univ. of Mich. Bull. N.S., XXII, No. 26. 1920.

Rehder, Alfred. Manual of Cultivated Trees and Shrubs. Macmillan. 2nd ed. 1940.

Sargent, F. L. Key to Common Deciduous Trees in Winter and Key to Common Woods. Cambridge, Mass. 1903.

Strausbaugh, P. D. and Earl L. Core, Trees and Shrubs of West Virginia. Mimeographed. Morgantown. 1935.

Trelease, William. Winter Botany. Published by the author. Urbana, 111. 1918.

Wiegand, K. M. and F. W. Foxworthy. A key to the genera of woody plants in winter. Ithaca, N.Y. 1904. 2nd ed., 1906. 3rd. ed. 1908.